/**
 * Created by My pc on 2017/1/30/030.
 */
function admin_top_nav(j) {
    for( var i = 0; i < 5; i++ ) {
        document.getElementById('nav' + i).style.backgroundPosition = 'left bottom';
        document.getElementById('nav' + i).style.color = '#fff';
    }
    document.getElementById('nav' + j).style.backgroundPosition = 'right bottom';
    document.getElementById('nav' + j).style.color = '#3b6ea5';
}